JsonConfigSlurper thingy

Small configuration library for java

Setup with Gradle

In build.gradle:

// Adds repository
maven{
    url 'https://github.com/aspic/java-builds/raw/master/'
}

// Enable dependency
dependencies {
    compile 'no.mehl.jconfig:java-config:0.1'
}

Standard usage

// Json properties
String json = "{ \"production\": { \"secretKey\": \"so secret\" } }";

// Creates config manager
ConfigManager manager = new ConfigManager.ConfigManagerBuilder().withJson(json).build();

// Returns the string for the production category
System.out.println(manager.getString("production", "secretKey")); // prints "so secret"

Config watchers

File watcher

The file watcher detects when an external config file is changed, and reads the new config into memory:

// Watch the file "config" in the directory "/tmp"
ConfigManager configManager = new ConfigManager.ConfigManagerBuilder()
                .withFileWatcher("/tmp", "config", 2, TimeUnit.SECONDS) // polls every second
                .build();

Remote file watcher

A remote file watcher downloads and parses a resource over HTTP:

// Watches a json resource from the specified url
ConfigManager manager = new ConfigManager.ConfigManagerBuilder()
                .withRemoteFileWatcher("http://localhost:80/config", 1, TimeUnit.HOURS) // hourly
                .build();

Config changes

Consumers can listen for config changes by adding a listener:

ConfigManagerListener listener = newConfig -> {
    System.out.println("some config changed, reload a property!");
};
configManager.addConfigChangedListener(listener);

aspic / jconfig